package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

        @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            //1.获取session,请求头中的token
            String token = request.getHeader("authorization");

            if (StrUtil.isBlank(token)){
                return true;
            }
            //获取redis中的用户信息
            Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);

            if (userMap.isEmpty()){
                return true;
            }
            //转成对象
            UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
            //保存对象
            UserHolder.saveUser(userDTO);
            //刷新token有效期
            stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
            //放行
            return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
